'Yáo tóu' literally means 'to shake the head' and functions as a verb describing the physical gesture of moving one's head side to side. The character 摇 (yáo) means 'to shake, sway, or rock', while 头 (tóu) means 'head'. Together, they form a common, highly idiomatic action verb used primarily to express disagreement, doubt, disbelief, or refusal—often nonverbally and without speaking.

This gesture is culturally universal but especially frequent in Chinese communication, appearing in everyday conversations, debates, classroom settings, and even in written dialogue to convey attitude or reaction. It can stand alone as a response ('He just shook his head') or accompany speech ('No,' he said, shaking his head). Unlike some verbs, 摇头 is almost always used intransitively and rarely takes an object—though it may be modified by adverbs like 慢慢地 (slowly) or 连连 (repeatedly).